Status report on the measurement of the Planck constant using the NIST-3 watt balance

Details Status report on the measurement of the Planck constant using the NIST-3 watt balance Status report on the measurement of the Planck constant using the NIST-3 watt balance

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprl14001s&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #L14.001

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The watt balance allows the comparison of virtual mechanical power to virtual electrical power with uncertainties of a few parts in 10^8. Since electrical power can be determined as the product of known numerical values, two frequencies, and the Planck constant by the virtue of modern quantum metrology, the watt balance is a link between mechanical power and the Planck constant, h. The NIST-3 watt balance was used in a 2007 measurement to determine h with a relative uncertainty of 3.6x10-8. We have recently started efforts for another high precision determination of h with this instrument. We present the status of the effort, discuss the largest contributions to the uncertainty budget, and share our plans for the future.

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